DeMint shocked Washington on Thursday when he said he would step down on Jan. 1 to join the Heritage Foundation, a conservative think tank. His departure comes just two years into a second, six-year term representing South Carolina.

While most of his colleagues were stunned, not all were saddened. DeMint sometimes frustrated follow Republicans by prizing ideology over electability.

He used his political action committee, the Senate Conservatives Fund, to bankroll candidates he backed. But candidates he actively supported in 2010 cost the GOP seats observers expected the party to win easily.

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